They had/have(?) a bylaw against "war games" in Chilliwack and it was a quick way to lose your guns/gear/field plus get fined back in the day. Not sure if this is still the case but you should probably make sure to get specific clearance from the city before you set up anywhere. I know a few people who have had their gear taken by the cops for bylaw violations in years past.

You should be able to set that field up with no problems aslong as it is on private property. Or your other option is to find something outside the actual city limits because most bylaws don't take effect outside the city.